public ParseResult(ParseFailureReason failureReason)
{
FailureReason = failureReason;
}
bool ParseNextInput(string inputLine, int startIndex, out int endIndex, out string parsedInput, out ParseFailureReason parseFailureReason)
{
bool parseSuccess = true;
parseFailureReason = ParseFailureReason.None;
// Skip leading whitespace
SkipWhiteSpace(inputLine, startIndex, out startIndex);
switch (inputLine[startIndex])
{
// Parse a quoted string
case '\"':
FindEndofQuoteOrEOL(inputLine, startIndex, out endIndex);
parsedInput = inputLine.Substring(startIndex, endIndex - startIndex);
if (endIndex >= inputLine.Length)
{
break;
}
// Skip any whitespace.
SkipWhiteSpace(inputLine, endIndex, out endIndex);
// Quit when an EOL is found
if (endIndex >= inputLine.Length)
{
break;
}
// If the next character isn't a comma, then we have a parse error.
if (inputLine[endIndex] != ',')
{
parseFailureReason = ParseFailureReason.CharactersAfterQuote;
parseSuccess = false;
endIndex = inputLine.IndexOf(',', endIndex);
if (endIndex == -1)
{
endIndex = inputLine.Length;
}
else
{
endIndex += 1;
}
}
else
{
endIndex += 1;
}
break;
// For a comma, return the default
case ',':
parsedInput = string.Empty;
endIndex = startIndex + 1;
break;
default:
endIndex = startIndex;
/* Either a comma or a colon end the string. A colon ends an input because in
* Microsoft BASIC GET/READ/INPUT share code and ':' is a statement separator.
*/
try
{
while (inputLine[endIndex] != ',' && inputLine[endIndex] != ':')
{
endIndex += 1;
}
}
catch (IndexOutOfRangeException)
{
}
parsedInput = inputLine.Substring(startIndex, endIndex - startIndex);
if (endIndex < inputLine.Length)
{
// If a colon was found, set an error and return.
if (inputLine[endIndex] == ':')
{
parseFailureReason = ParseFailureReason.Colon;
parseSuccess = false;
endIndex = inputLine.Length;
}
else
{
endIndex += 1;
}
}
break;
}
return(parseSuccess);
}